Heeling-machine.



B. F. MAYO. HEELING MACHINE. APPLICATION Flu-:0 JULY 30. 1911.

1 ,31 899 Patented Apr. 29,1919.

l l I I l I I l I nan no.

innnqannvr. nave, or satnn, nAssAonUs r-rs, ASSIGNOR, BY MESNE Assmmu'an'rs,

To unrrnn snon MAGI-I-INEBY CORPORATION, or zearnnson, new Jensen, a conrete tion on new JERSEY.

HEELiNG-MACHINE.

teenage.

Specification of Letters; Patent.

Patented Apr. 29, 191w.

Apphcation filed July 30, 1917. serial No. 183,488.

To all whom it may concern Be it known that I, BENJAMIN F. MAYO, a citizen of the United States, residing at Salem, in the county of Essex and State of Massachusetts, have invented certain Im provements in Heeling Machines, of which the following description, in connection with the accompanying drawings, is a specification, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to heeling ma chines, and more particularly to that type of heeling machine in which provision is made for. measuring the thickness of the workpreliminarily to the application of the .fin'al pressure and the driving of the nails.

In machines of the type referred to, it is customary to lock the measuring mechanism after its operation, in order to prevent it from slipping under the stress of the very heavy, final pressure to which the work is subjected before and during the nail driving operation.

The object of the present invention is to provide improved means for unlocking the measuring mechanism at the completion of a complete disclosure of a heelingmachine to which my invention is applicable.

In the machine disclosed'in the-applica tion above referred to, frictional means is provided for locking the measuring mechanism against slipping at the time when it has to support the final pressure and afeature of the present invention resides in the provision of means for partly or wholly disengaging the cooperating friction surfaces in order to permit the measuring mechanism to be easily reset'after the locking device has performed its function. g

In a preferred form of the invention the measuring mechanism may include a rotatable screw and the locking means may conveniently consist of cooperating conical der to permit free action of the screw when it is to be reset.

Other features and advantages, more or less specific, incident to and resulting from the use of the invention, will be apparent from a reading of the following specificatlon in connection with the accompanying drawings, and the scope of the invention will be defined in the appended claims.

In the drawings,

Figure 1 is a view, partly in section and partly in elevation, showing the measuring and final pressure mechanisms of a heeling machine and a form of unlocking mechanism embodying the present invention; and

Fig. 2 is a perspective view showing, upon an enlarged scale, a detail of the unlocking mechanism.

The numeral 10 indicates the base or frame of theheeling machine. The usual reciprocatingdriver carrying spindle is indicated at 12. The spindle 12 is actuated by a toggle 14, operated, through a connecting rod 16, from a crank 18, as is usual in ma- 1 chines of this type.

A back rod 20, at the rear of the machine,

transmits the measuring movement to the work andthe amount of measuring inovement is controlled by an adjustable stop 22.

The measuring operation is accomplished primarily by a screw 24 which, when it is rotated, produces longitudinal movement of a non-rotatable nut 26 connected to the back rod 20 by a toggle link 28. After the measuring is accomplished, the final pressure is applied to the work by straightening the toggle comprising the link 28 and the back rod 20. This is effected by straightening a toggle, consisting of links 30, 32, by power derived from the connecting rod 16 and transmitted through a link 34. The screw 24 is provided with an enlarged comcal portion 36 and a coijperating, correspondingly formed, conical seat is provided in the stationary bracket 38 secured to the frame 10. Below the cone 36 a pinion 40 is formed upon the stem of the screw 24 and a rack 42, meshing with the pinion, is

guided in suitable ways in the bracket 38 for reciprocation forwardly and rearwardly of the machine. A heavy spring 44, connected at its rear end to the rack 42 and at its front end to the machine frame, provides the necessary force for drawing the rack forwardly to effect the measuring operation. When the machine is at rest, the spring 44 is held under tension, ready to perform its measuring function, by the engagement of a dog 46, upon the rack 42, with a hook 48 controlled by the connecting rod'16.

When it is desired to measure the work, a plunger 50 is operated to release the dog from the hook 48, permitting the spring 44, through the rack 42, to rotate the measuring screw and elevate the nut 26. As the measuring pressure is applied to the Work the cone 36 is, by reaction, forced more and more tightly into its seat and when the measuring operation is completed the frictional engagement between the two conical surfaces effectually locks the measuring screw against rotation under the stress of the subsequentlyapplied, heavy, final pressure.

Themechanism thus far described is disclosed and claimed in the Benjamin application, previously referred to, and is described here merely for the purpose of illustrating the application of my invention.

After the release of the final pressure, the measuring screw 24 must be rotated in a reverse direction in order to retract the back .rod 20 and reset the machine for the next operation. When the cone 36 is very tightly seated in the member 38 an excessive amount of power may be required to dislodge it preparatory to its reverse rotation. By the present invention, however,'I have provided means for preliminarily disengaging the cone, more or less, from its seat in order to permit reverse rotation of the measurlng screw without undue waste of "power.

Referring to Fig.1, a plug 52, having a hemispherical cavity, is'inserted in the lower end of the stem of the measurlng screw and one end of a 'pin'54, having hemispherical ends, is seated in the cavity. The other end threaded into the cam lever, to provide for adjustment of the plug.

Projecting rearwardly from the cam lever 58 is a pin 64 to the outer end of which is attached one end of a tension spring 66. The other end of the spring is anchored to a stationary pin 68. The purpose of the sprlng is to hold a cam roll 70, mounted in the inner end of the cam lever 58, in engagement with a cam 72 rigidly mounted upon the crank shaft of the machine. Nhen the machine is at rest, and during the measuring, the final pressure, and nail driving, the cam does not 0 erate upon the cam roll but immediate y after the release of the final pressure, the cam depresses the cam roll and, consequently, raises the in 54 and the measuring screw, moving the cone 36 axially until it is disengaged from its seat in the member 38. The measuring screw is now free to rotate and is automatically reset prior.

to the stopping of the machine.

The machine stops with the crank 18 and the cam 72 in approximately the position shown in Fig.1, the cam roll 70 having dropped 06 the high part of the cam after.

the measuring mechanism is reset. The lon gitudinal position of the measuring screw and the cone 36 is thus no longer controlled by the cam 72 and the cone is free to seat itself and lock the screw again at the con clusion of the next measuring operation.

The screw 62 permits such adjustment of the measuring screw relatively to the unlocking mechanism as to allow the cone 36 to be seated properly and to be disengaged at the proper time in the operation of the machine.

Having described my invention, what I claim as new and desire to secure by Letters Patent of the United States is 1. In a machine of the class described, the

combination of a measuring screw, means for rotating the screw to effect a measuring operation, means, provided with coeperating frlctlon surfaces for lock1ng the screw to a statlonary part of the machlne, and means 7 for disengaging said surfaces to permit free action of the screw.

2. In a heeling machlne, the combination of ameasurlng screw, frlctional means for locking the screw to a stationary part of the amachlne, and means for releasing the screw.

3. In a heeling machine, the combination of a measuring screw, means for rotating the screw. to effect a measuring operation, a eoni cal locking member upon the screw, a cooperating stationary locking member, and means for disengaging said locking members to permit free action of the screw.

4. Ina heeling machine, the combination for rotating the screw to move the work support, a conical locking member connected to rotate with the screw, a co6perating stationary conical locking member, and means for of a work-support, a measuringscrew, means effecting relative axial movement of said locking members to disengage them and permit free action of the screw.

5. In a heeling machine, the combination for efi'ccting axial movement of the first of a work support, a measuring screw, conmentioned locking member to disengage it nections between the measuring screw and from the stationary locking member and per- 10 work support, means for rotating the screw mit free action of the screw.

- 5 to move the work support, a conical locking In testimony whereof I have signed my member upon the screw, a cooperating staname to this specification. tionary conical locking member, and means BENJAMIN F. MAYO.

Uopies of this patent may be obtained for five cents each, by addressing the Commissioner of Eatents,

Washington, 10.0. 

